Hi,

Do a search for P1235 - there are a few results with potential fixes

Cheers,

Iain

 

HERE.

From one of our resident Alfa technicians.

P1235 Fuel Pump Control Out Of Range

 

it thought it was egr related .... look for threads by Hessian

 

Never knew GTA's (or any petrol) had EGRs

 

http://www.alfaowner.com/Forum/alfa-147-156-and-gt/78885-156-1-9jtd-16v-mjet-p1235.html

 

I thought it was EGR valve and fitted new one. Actuator test performed and valve works, all connections and wiring OK and full continuity to ECU. Any further ideas? What does it mean by Fuel Pump Control out of Range?

 

OP says it's a 2.4JTD...

 

& his profile says GTA, i can see why Roberto got mixed up

 

That's what you get for having 3 forums open at the same time. Speed read posts and not digest info.

 

See how it compares with my issue...

http://www.alfaowner.com/Forum/alfa-147-156-and-gt/174716-p1235-positive-boost-pressure-governor-deviation.html

 

Thanks for help everyone.
I called JJB Motors who said it was the vaccuum pipe from turbo to Turbo Boost Valve or the valve itself.
It turned out to be a split vaccuum pipe, very cheap fix cos only a 10cmm piece of vaccuum pipe needed.
Recommend JJB Motors to any one as they are very knowledgeable and helpful.
Again thanks all for help.

 

Glad you got it sorted. Can you please read my thread above to see if it is similar ? Also, what did it cost to fix ?

 

The cost was £2.00 for a length of vaccuum hose and the repair takes about ten minutes. As you open the bonnet, on top of the radiator on the left hand side there is an electro valve, this is the Turbo Boost pressure valve, there is a vaccuum pipe connected to it which goes down the back of the radiator (attached to the cooling fan housing) and the other end connects to the turbo unit. Remove this pipe and replace the vaccuum hoses (approx 15cm each side). This should fix it as it fixed mine. If it does not fix it then you will probably need a new valve.
Hope this helps

 

Thanks for the accurate description gianco. My car is a 156 1.9 JTD so I have taken a couple of photos in hope it's in the same location...

Is this the Turbo Boost pressure valve ?, pic1

This the vacuum pipe coming out the bottom of it, pic2

You can see a split in the pipe, but not much of one since it is the nozzle directly beneath it. The pipe is less than 1cm in diameter. If this can be confirmed as the turbo vacuum tube I shall get it replaced.

 

Yes it is the valve and looks like the correct pipe which you can see is badly perished. Replace the pipe first and I think you should be ok.

 

Excellent, that was exactly my problem. I now have a full band of power, without errors. Thank you so much Gianco for you help.

 

Glad your cars are all sorted now.

 

Thanks to Hessian and Gianco for the info. A garage diagnosed the P1235 fault yesterday on my 156 TJD mjet and told me it was likely to be a turbo problem, either sticing vanes or replacement turbo required which either way thought sounded expensive. I will check out the vacuum pipe for any splits and hopefully be able to solve the problem. Have the same symptoms as Hessian.

Thanks

 

I brought some silicone hose from e-bay 4mm nominal bore .... and in a nice red colour so any splits ect will be easyer to see

 

This is a confusing thread. P1235 is nothing to do with the turbo. It's fuel related. P0235 is a turbo boost pressure fault.

 

Just to say I've replaced the vacuum hose, and sure enough the car's got some accelaration again. The "motor control system failure" is still displaying, but I'm sure the problem is solved now. Thanks very much for the info, much appreciated.

 

I had a P1235 error code come on my 2,4 20v JTD and the car went into 'limp home mode' once I hit 70mph.
A friend had the Fiat ECU scan software on his lap top and this said, Pressure boost signal. Pressure in suction manifold exceeds allowable threshold. Again it was the small vacuum input hose which had split. So this is clearly a common problem. So thanks to all those who have posted hear as I was able to trace the fault thanks to this thread.

 

Glad you guys got it sorted, I did make a post about the vacume pipes and It did happen often just after picking up there new car like it did to me and my theory is the rubber goes hard when the cars not being used..... not all of them but alot!
Bright silicone hose does make it easy to check them and brightens up the engine bay

 

I had just bought my car as well and it was not used for at least three weeks. It snapped its aux drive belt on the way home as it had not been set correctly and was squealing a bit. So I decided to change the cam belt, water pump, tensioners, pulleys ect and give it a service as it was due and had 97000 on the clock. Then I was away for a while. When I got back and drove just two miles the motor control light came on and it went to safe mode as I got up to 70mph !! I learn,t from AO that the water pumps fail and I discovered mine was on its last legs, so this forum, or rather its members, have saved me a lot of money. The correct tensioning procedure of the aux drive belt took some working out though, even with a copy of the CD manual.

 

Another old thread that keeps on giving.
I had the P1235 today and you guys sent me to find the split pipe. there it was.
Thanks a lot.

 

Same here today, also 2.4 20V. Thanks from Holland:thumbs:

 

just for future reference:

all OBD codes in the P1000 to P1999 range are manufacturer specific, so you need a reference list for your specific car. The same code can mean different things even with different models/years of manufacture and will have a different meaning between brands.

MultiEcuScan will be the best bet to get meaningful error codes in this range.

 

I am taking the liberty of posting here on this very subject, cause i have exact this P1235 since first test drive with my 1.9JTD 16V.

Used software is Multiecuscan and it´s NOT fuel related

The engine is runnig smooth and perfect, but when putting "metal to metal" -> over 3000rpm, third or fourth gear uphill, faultycode and red engine light apears, but no limp mode. Limpmode is active when slowing down

I don't believe there is a problem with the turbo itself, because i can delete the faultycode and the car drives as nothing happend.

It´s time to buy a smoke-machine to solve this problems quick and easy. So ... right now, i have to check with vacuum pump ...

my question is -> do you know which inner diameter this small vacuum hoses have?

3mm or 3,5mm or 4mm?